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adsurl = {http://adsabs.harvard.edu/abs/1967pswh.book.....Z},  adsnote = {Provided by the SAO/NASA Astrophysics Data System}  }  @Article{PER-GRA:2007,   Author = {P\'erez, Fernando and Granger, Brian E.},   Title = {{IP}ython: a System for Interactive Scientific Computing},   Journal = {Computing in Science and Engineering},   Volume = {9},   Number = {3},   Pages = {21--29},   month = may,   year = 2007,   url = "http://ipython.org",   ISSN = "1521-9615",   doi = {10.1109/MCSE.2007.53},   publisher = {IEEE Computer Society},   }